From 2f43e4058e399cab57ca48386e16b79920c1387b Mon Sep 17 00:00:00 2001
From: Axel Menzel <info@axelmenzel.de>
Date: Sun, 22 Jan 2017 21:44:46 +0100
Subject: [PATCH] fixed hard coded cmake install prefix

the CMAKE_INSTALL_PREFIX was hardoced, this
fix allows the user change the install prefix.

Fixes #34
---
 CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c8b04bfa..5ae80ef3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -87,4 +87,6 @@ if (BUILD_DOCUMENTATION)
 endif()
 
 # here we specify the installation directory
-set(CMAKE_INSTALL_PREFIX ${RTTR_INSTALL_DIR} CACHE PATH  "RTTR install prefix" FORCE)
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+  set(CMAKE_INSTALL_PREFIX ${RTTR_INSTALL_DIR} CACHE PATH  "RTTR install prefix" FORCE)
+endif()